In a world where there are people with magical powers, of which only a few individuals know of it, the young Nagi meets Mashiro-kun, a boy who owns them, as rarely happens. However Mashiro-kun is not able to control his powers, making bad things happen every time he is in contact with girls... But despite this, Nagi wants to get close to him...

Ito and Chiharu, though seven years apart, share a very deep friendship in which Ito has an unrequited love for Chiharu. In a turn of events, Chiharu is afflicted with a terminal illness and is put into an induced comatose state in hopes that a cure will be developed while he is sleeping. After seven years, Chiharu wakes up, and finds that Ito is now the same age as him, and that his then-classmate has become his homeroom teacher.